Perplexity

Intermediate

Exponential of average negative log-likelihood; lower means better predictive fit, not necessarily better utility.

Full Definition

Exponential of average negative log-likelihood; lower means better predictive fit, not necessarily better utility.

Keywords

LM quality metric

Domains

Evaluation & Benchmarking

Related Terms

Benchmark related to

A dataset + metric suite for comparing models; can be gamed or misaligned with real-world goals.

 PR Curve related to

Often more informative than ROC on imbalanced datasets; focuses on positive class performance.

 Brier Score related to

A proper scoring rule measuring squared error of predicted probabilities for binary outcomes.

 Experiment Tracking related to

Logging hyperparameters, code versions, data snapshots, and results to reproduce and compare experiments.

 Observability related to

A broader capability to infer internal system state from telemetry, crucial for AI services and agents.

Concept Map

See how Perplexity connects to other concepts.

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